Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

In Young's double slit experiment, carried out with light of wavelength l = 5000 Å, the distance between the slits is 0.2 mm and the screen is at 200 cm from the slits. The central maximum is at x = 0. The third maximum (taking the central maximum as zeroth maximum) will be at x equal to              (a) 1.67 cm(b) 1.5 cm(c) 0.5 cm(d) 5.0 cm

Assertion  :   When the speed of an electron increases its specific charge decreases.
Reason      : Specific charge is the ratio of the charge to mass.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

Consider the following statements A and B and identify the correct choice of the given answers
(A) A zener diode is always connected in reverse bias
(B) The potential barrier of a PN junction lies between 0.1 to 0.3 V approximately(a) A and B are correct (b) A and B are wrong(c) A is correct but B is wrong(d) A is wrong but B is correct

A transformer is used to(a) Change the alternating potential (b) Change the alternating current(c) To prevent the power loss in alternating current flow (d) To increase the power of current source

Consider two point charges of equal magnitude and opposite sign separated by a certain distance. The neutral point due to them(a) Does not exist(b) Will be in mid way between them(c) Lies on the perpendicular bisector of the line joining the two(d) Will be closer to the negative charge

Holes are charge carriers in (a) Intrinsic semiconductors(b) P-type semiconductors(c) Metals(d) a, b

Which of the following has zero average value in a plane electromagnetic wave?

The ________ drawn at any point on the magnetic lines of force gives direction of magnetic field at that point.

The unit for molar susceptibility is

In a RLC circuit capacitance is changed from C to 2C. For the resonant frequency to remain unchanged, the inductance should be changed from L to.